With the rapid development of the global photovoltaic (PV) industry, the scale of solar power systems is continuously expanding, from large ground-mounted PV plants to distributed rooftop systems. As a result, the performance requirements for electrical cables have become increasingly stringent. PV systems often need to operate reliably in high-temperature, humid, and high UV environments. Cables, as a key medium for electrical connections, play a critical role in ensuring system safety and longevity. In particular, heat resistance is a crucial factor in maintaining stable operation during summer peak temperatures.
RHW-2 cable, certified under UL standards, is widely adopted in the PV industry due to its excellent heat, moisture, and weather resistance. It not only meets the strict requirements of the North American market but also maintains stable electrical and mechanical performance under high-temperature, humid, and outdoor conditions. This article focuses on the heat resistance testing of RHW-2 cable and its practical application in PV systems, highlighting its advantages through comparison with other common cables.
Overview of RHW-2 Cable
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Cable Structure and Materials
RHW-2 cable consists of high-conductivity copper conductors and cross-linked polyethylene (XLPE) insulation. Copper ensures efficient current transmission and mechanical flexibility, while XLPE insulation provides excellent heat and moisture resistance. The cable is rated for continuous operation at 90°C and can withstand short-term temperatures up to 110°C. This design ensures electrical insulation and structural integrity even under extreme conditions. Additionally, RHW-2 offers superior UV resistance, making it suitable for long-term outdoor use.
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Application Scenarios
In photovoltaic systems, RHW-2 cable is commonly used for:
- Interconnection wiring between PV modules
- Connections from combiner boxes to inverters
- Rooftop PV systems and large ground-mounted PV plants operating in high-temperature and high-humidity environments
These scenarios require cables with reliable heat, moisture, and weather resistance, all of which RHW-2 is designed to deliver.
Heat Resistance Testing of RHW-2 Cable
Testing Methods
The heat resistance of RHW-2 cable is evaluated following UL standards and includes:
1.Long-term high-temperature energization tests – simulating continuous operation under elevated temperatures to monitor insulation stability.
2.Thermal aging tests – exposing the cable to constant high temperatures to assess insulation lifespan and mechanical strength.
3.Insulation retention measurements – evaluating the cable's insulation resistance and breakdown strength after prolonged high-temperature operation.
These tests comprehensively assess the cable's performance under real PV operating conditions.
Test Results and Performance
Test results demonstrate that RHW-2 cable maintains stable insulation properties under continuous 90°C operation. Even under short-term overload, it can withstand up to 110°C without insulation breakdown or conductor damage. This ensures safe and reliable operation in environments with high summer temperatures and significant day-night temperature fluctuations.
Comparison with Other Common Cables
To illustrate the advantages of RHW-2 cable, it is compared with XHHW-2 in terms of heat resistance, moisture tolerance, and installation flexibility:
| Feature | RHW-2 | XHHW-2 |
|---|---|---|
| Rated Operating Temperature | 90°C (short-term 110°C) | 90°C (short-term 105°C) |
| Moisture Tolerance | Excellent; stable in high-humidity conditions | Good; performance may slightly degrade under prolonged high humidity |
| Flexibility | High; easy rooftop installation | Stiffer; slightly lower installation flexibility |
| UV Resistance | Excellent | Excellent |
| Recommended PV Applications | PV module interconnection, combiner box to inverter | Mainly combiner box interior and dry environments |
The comparison highlights RHW-2's superior heat and moisture resistance and better installation flexibility for complex PV applications.
Advantages of RHW-2 Cable in PV Applications
1.High-temperature stability – ensures safe operation during summer peak temperatures.
2.Long service life – heat, moisture, and UV resistance reduce lifecycle costs.
3.Installation flexibility – high flexibility facilitates fast wiring in both rooftop and large ground-mounted PV projects.
4.Compliance with North American standards – UL certification ensures adherence to safety and technical requirements for PV projects in the Americas.
These characteristics make RHW-2 a reliable and efficient choice for PV systems.
RHW-2 Cable and PV System Reliability
PV systems experience significant day-night temperature swings, high summer heat, and long-term exposure to humid conditions. RHW-2 cable excels under thermal cycling and moisture stress, enhancing overall system reliability. For example, in a large ground-mounted PV plant, using RHW-2 for module interconnection and combiner box wiring significantly improved operational stability. Even under extreme weather, cables showed no aging or cracking, reducing maintenance frequency and minimizing downtime risk.
Product and Service Advantages
Comprehensive Cable Solutions
- Product Strengths
We specialize in manufacturing UL-certified electrical cables, including THHN, THW, MC cable, AC cable, and more. Our UL wire series provides customers with solutions suitable for various PV and power projects.
- Compliance with North American Markets
Products strictly follow UL standards, meeting technical and safety requirements for PV plant construction and power installations in North America.
- Complete Range of Specifications
RHW-2 cable covers a wide range of sizes, from small-scale systems to large PV projects, ensuring suitability for various voltage levels and installation environments.
- Fast Delivery Capability
Efficient production and logistics enable rapid delivery and support for both small and bulk orders, accommodating urgent and long-term project needs.
- Service Excellence
- Professional technical support is available pre- and post-sale, providing comprehensive solutions to ensure cable safety and reliability.
- Global Partnerships
With years of manufacturing and export experience, our partners span the globe, allowing us to manage multinational PV and power projects effectively.
- UL Certification
All cables are UL-certified, ensuring compliance with international standards and project safety.
- Customization Services
We provide multi-dimensional customization, including material, size, length, color, performance, labeling, and packaging. Color options are abundant, meeting diverse project requirements and design preferences.
Partnership Invitation
Heat resistance testing and practical application of RHW-2 cable demonstrate its exceptional performance in high-temperature, high-humidity, and outdoor environments. Coupled with our manufacturing capacity, logistics efficiency, and global cooperation experience, we provide reliable PV wiring solutions. RHW-2 cable ensures safe, efficient, and durable electrical connections for both large ground-mounted PV plants and rooftop distributed systems.
We invite customers to contact us for professional cable selection guidance and customized solutions, ensuring your PV projects achieve optimal performance.
Company Information
Dongguan Greater Wire & Cable Co., Ltd.
- Tel/WhatsApp/Wechat: +86 135 1078 4550 / +86 136 6257 9592
- Email: manager01@greaterwire.com